On the wedding day, "Weng avoids the highest day and cares for the highest river", which means to choose the wedding day and reconcile the relationship between Weng and Gu. The highest plough refers to Chen, which belongs to hexagrams. It's dry palace, it's father. Therefore, if you choose the wedding day, it will be bad for the relationship between the man's parents or daughter-in-law and the family. He Kui refers to the divination Xu, the eldest daughter. Therefore, if he commits He Kui on the wedding day, it will be bad for the man's brother and sister or the relationship between the daughter-in-law and the man's brother and sister is not good. Because the wedding date is mainly chosen according to the bride's eight characters.